Onchocerca

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Onchocerca

[ong″ko-ser´kah]

a genus of parasitic filaria. O. vol′vulus is a common parasite of humans, breeding in fast-flowing rivers and streams in tropical parts of the Americas and equatorial Africa, particularly West Africa. It is the etiologic agent of human onchocerciasis and is transmitted by the bites of blackflies (buffalo gnats) of the genus Simulium, in which the parasite passes part of its life cycle.

Onchocerca

(ong'kō-ser'kă),

A genus of elongated filariform nematodes (family Onchocercidae) that inhabit the connective tissue of their hosts, usually within firm nodules in which these parasites are coiled and entangled.

Onchocerca

/On·cho·cer·ca/ (ong″ko-ser´kah) a genus of nematode parasites of the superfamily Filarioidea, including O. vol´vulus, which causes onchocerciasis.

Onchocerca

[ong′kōsər′kə]

Etymology: Gk, onkos, tumor + kerkos, tail

a genus of nematode parasites of the superfamily Filarioidea that infects humans and ruminants. The adults live and breed in subcutaneous fibroid nodules. The young (the microfilariae) are carried by the lymph and are found chiefly in the skin, subcutaneous connective tissues, and eyes. O. volvulus is a common parasite of humans that breeds in fast-flowing rivers and streams in tropical regions of the Americas and Africa, particularly West Africa. It is the cause of human onchocerciasis and is transmitted by the bites of buffalo gnats.

On·cho·cer·ca

(ong'kō-ser'kă)

A genus of elongated filariform nematodes that inhabit host's connective tissue, usually within firm nodules in which these parasites are coiled and entangled. Synonym(s): Oncocerca.

[G. onkos, a barb, + kerkos, tail]

Onchocerca

a genus of nematode parasites in the family Onchocercidae. They are important as causes of onchocercosis. Their life cycles depend on the carriage of larval microfilariae by a variety of insects, chiefly mosquitoes, black flies and midges (families Simuliidae and Ceratopogonidae). The microfilariae are found in the lymph and connective tissue spaces of the skin. Called also Wehrdikmansia.

Onchocerca armillata

the microfilariae are found in the skin of the hump, withers, neck, dewlap and umbilicus and the adults in the aorta of cattle, buffalo, sheep, goats and donkeys.

found in nodules on the brisket and the lateral aspects of the hindlimbs of buffalo. Called also O. sweetae.

Onchocerca cervicalis

found in the ligamentum nuchae of the horse and mule. The microfilariae are commonest in the area of the linea alba. Etiologically related to the occurrence of fistulous withers, poll evil, equine conjunctivitis and possibly equine recurrent ophthalmitis.

Onchocerca cervipedis

found in the subcutaneous tissues of the neck and limbs of deer.

Onchocerca dukei

adults are found in nodules in subcutaneous and perimuscular sites in cattle, mostly in the thorax, abdomen, diaphragm and thighs.

Onchocerca flexuosa

occurs in deer.

Onchocerca garmsi

parasites of deer.

Onchocerca gibsoni

found in nodules under the skin of the brisket or the lateral aspect of the hindlimbs of Bos taurus and Bos indicus cattle.

Onchocerca gutturosa

found in cattle and buffalo in the ligamentum nuchae, on the scapular cartilage and in the hip, shoulder and stifle areas.

Onchocerca lienalis

found in the gastrosplenic ligament, on the capsule of the spleen and above the xiphisternum in cattle.

Onchocerca ochengi

found in cattle, in nodules in cutaneous and subcutaneous sites on the udder, scrotum and flanks.

Onchocerca raillieti

adult worms are found in the ligamentum nuchae, in subcutaneous cysts on the penis and in perimuscular connective tissue of donkeys.

Onchocerca reticulata

a parasite of horses, mules and donkeys. Adult worms are found in the connective tissue of flexor tendons and suspensory ligament of the fetlock, mostly in the forelimb.

Onchocerca rugosicauda

found in the subcutaneous fascia in the shoulders and back of roe deer.

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